Heating apparatus for incubators.



"No. 752,230. PATBNTED FEB. 16,1904.

M. M. JOHNSON. HEATING APPARATUS FOR INOUBATORS.

APPLICATION FILED AUG.17,1003.

I0 XODIZL. Z BHEETB-SHEET 1.

1v- H u Inventor.

No. 752,230. PATENTED FEB. 16, 1904. M. M. JOHNSON.

' HEATING APPARATUS FOR INUUBATORS.

nruonmx nun um. 11. 1903. I0 lonnL. a alums-sum 2.

FIGE,

Invcptor 5 Jaw/1275027.

UNITED STATES Patented February 16, 1904.

PATENT OFFICE.

HEATING APPARATUS FOR INCUBATOFIS- srnolmca'rrom' forming part ofLetters 1 mm. No. 752,230,

dated. February 16, 1904.

Application iiloii August 17, 1903. Serial Ko.189,756. (No model.)

To all whom it mrty concern.-

qirovements in hot-water boilers for incuba-.

tors breeders, and the like. v

he ob'ect of my invention is' to improve and simpiify the constructionandoperation' of devices of this character, thereby render.- ing themmore eflicient in operation and less expensive to manufacture.

With this and other obiects in view the invention consists of certainnovel features of construction,combination, and arrangement of parts, aswill be more'fullyv described, and particularly pointed out in theappended claims.

In the accompanying drawings Figure lis a top plan view of my improvehotswater boiler, showing it applied to an incubator. Fig. 2 is avertical sectional view through the same taken on the line 2 2 ofFig. 1. Fig. 8 is a vertical-sectional view taken on theline B 8 ofFig. 1. Fig. 4 is a horizontal sectional view taken on the line 4 4 ofFig. 8. is a detail sectional view taken on the line 515 of Fig. 4.

Re erring to the drawings by numerals, 1 denotes an incubator whichconsists of the usual outer and inner casings, with a dead-air spacebetween them, an egg-chamber 2, and a hot-waterheater 8 which may be ofany well-known- It may be a sys-,' hot-water tank, or,

or preferre construction. tem of hot-water pipes, a as conventionally;represented inthe drawings, a hot-water tan provided with one or morebathe-plates to cause a circulation of the hot water-and with flow andreturnpi s 4 and 5, which are in connection with t 0 waterspace ofmy-improv' boiler 6.

The 'hot-water boiler 6 is preferably rectannarrow space 10 which isclosed by the flue 7 is surrounded Fig. 5

gular in form and is disposed longitudinally upon the outside of one endof the incubator. One end of the shell of the boiler is closed by avertical flue or pipe 7, which is in communication at its center with ahorizontal branch flue or pipe 8, which extends longitudinally throughthe boiler-shell and is secured to the inner side wall of said shell, asshown at 9. This horizontal flue 8 is of less diameter than the width ofthe boiler-shell, so as to leave a between the .outer side wall of theshell and the said flue, through which space the water must pass, thuscausing the latter to be brought more in contact with said flue. Asshown in Fig. 2, the flow-pipe 4 of the heater communicates with thewater-space in the u per portion of the shell above the flue 8 anadjacent to the vertical flue 7, and the return-pipe 5 is incommunication with the lower portion of the shell directly beneath thepipe 4, so that the water will circulate, as indicated by the arrows inFig. 2. Asuitable flllinginlet 11 is provided on the top of theboiler-shell and is closed by a screw-cap 12.

- The end of the boiler-shell opposite that end a casing or housing 13,which is in the form of a rectangular box having one and open andtelescoping over the said end of the shell.

This casinglB is removable to permit of access to the flue 8when it isdesired to clean the same,.-and it is of eater width than the width-of.the boiler-s ell, so that spaces 14 will be formed between the sides ofthe boilershell and. the sides of the casing, which spaces communicatewith the discharge end of the flue S-through a space 15, formed betweenthe ends of the shel and its casing, as clearly shown in Fig. 4. Theheated air and products .of combustion from the lamp or other heaterhereihafter described after passing through 'the flue 8 will pass intothe space 15 and then through the spaces 14, which discharge to theatmosphere, as shown. It will be seen that said casing will not onlyhold the heat a greater len h of time in contact with the boiler-shell,an thus produce a greater heating-surface, but it will also protect thesame a ainstdrafts of cold air, as will be readily un erstood.

The chimney or discharge-pipe 16 of a lamp or other heater 17 dischargesinto the lower end of the vertical flue 7, the upper end of which isclosed and controlled by a damper 18, carried by one arm of a lever 19,which is fulcrumcd at 20 between cars 21, secured upon the end of thecasing 13. The opposite and shorter arm of said damper-lever isconnected by an adjustable link 22 to one arm 23 of a regulating-lever24, which is fulcrumcd within the egg-chamber 2 and operated by athermostatic disk 25. The arm 23 of said lever 24 projects. through anelongated aperture or slot in the end wall of the incubator in order topermit said lever to move freely.

In the operation of the apparatus when the temperature within theincubator is normal the upper end of the flue 7 will be closed by thedamper 18 and the heat from the lamp will pass upwardly into said flue,then laterally through the horizontal pipe 8, then through the spaces 15and 14 and discharge to the atmosphere, as previously explained. Thewater in the boiler being in contact with the flues 7 and 8 and thesides and end of the shell which the heat passes around will becomethoroughly heated and produce a circulation through the boiler and theheater 3, as indicated by the arrows inFig. 2. The location of the flue8 in the boiler between the flow and return pipes 4 and 6 is such thatthe water must pass around the same at its hottest point, and it will befurther seen that the arrangement of said pipes, the flues, and theeasing will present a very large heat-radiating surface, and thusproduce an'efflcicnt boiler.

When the temperature in the egg-chamber rises above normal, the exansion of the disk 25 will impart motion to' t 1e lever 24, whichthrough the link 22 will operate the lever 19 and raise the damper 18 topcrmit'the heat to pass directly out of the upper end of the flue- Therapid escape of the heat through said flue 7 will cause a suction ordraft of cold air through the passages 14 15 and the flue 8,- which willtend to re iidly cool the boiler.

It is thus seen thatt e casing not only serves to hold the heated air incontact with'the boiler-shell and to protect the same against cold air,but also provides means for causing a draft of cold air to be brought incontact with the boiler-shell when it is desired to reduce the'temperatureof said boiler.

From the foregoing description, taken in connection with theaccompanying drawings, the construction and operation of the inventionwill be readily understood without re- .quiring a more extendedexplanation.

Various changes in the form, proportion, and the minor details ofconstruction may be resorted to without departing from the principle orsacrificing any of the advantages of this invention.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is

1. The combination with an incubator, of a hot-water conduit locatedtherein, a boiler having a vertical flue at one end and a horizontalflue communicating with said vertical flue, extending longitudinally ofthe boiler and spaced from the sides thereof, flow and return pipesconnecting the conduit with the side of the boiler and respectivelycommunieating with the latter above and below the horizontal flue, and adamper for the vertical flue, substantially as described.

2. A hot-water boiler for incubators and the like, comprising a shell,0. vertical flue at one end of the same, a horizontal flue communicatingwith said vertical flue, extending longitudinally from the boiler andspaced from the sides thereof, flow and return pipes respectivelycommunicating with the side of the boiler above and below the horizontalflue, and a damper for the vertical flue, substantially as described.

8. In combination with an incubator and a hot-water conduit therein, aboiler located without the incubator and having a horizontal flueextending therethrough, and a casing on the boiler, into which thehorizontal flue discharges, the casing forming return hot-air passagesat the sides of the boiler, substantially as described.

4. The combination with an incubator having abet-water conduit and atemperature'regulating device located therein, of a boiler hav ing avertical flue at one end and a longitudinal flue in eommunination withsaid vertical flue and dischar ing at the opposite end of saidboiler,"flow and return connections between said boiler and saidconduit, a spaced casing or jacket upon that end of the boiler at whichsaid longitudinal flue discharges, and a regulating-darnrlFer upon theupper end of said vertical flue apted to be raised by saidtemperature-regulating device when the temperature in the incubator isabove normal to permit of the escape of the heat through the upper endof said flue and to thereby cause a draft of cold air to be brought incontact with the sides and end of the boiler surrounded by said casing,substantially as described.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

MANANDER MOTT JOHNSON.

Witnesses:

Louis C. Faun, HARRY H. JonNsoN.

